Rozhen Observation Calendar

Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.

Best nights for Triangulum Pinwheel: 01-30 (92), 01-31 (92), 01-29 (91), 02-01 (91), 02-02 (90) — by astronomy; check the weather when the night is within four days.

2032-01-21astronomy score per night — click a bar for that night2032-02-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-01-21 Wed	25	—	unknown	19:00–23:30 (marginal, 4.5 h)	79.1° 17:55	11.09	74%	33.2°
2032-01-22 Thu	24	—	unknown	19:05–23:20 (marginal, 4.25 h)	79.1° 17:50	11.07	82%	43.9°
2032-01-23 Fri	27	—	unknown	19:05–23:15 (marginal, 4.17 h)	79.1° 17:45	11.04	89%	54.9°
2032-01-24 Sat	33	—	unknown	19:05–23:15 (marginal, 4.17 h)	79.1° 17:45	11.01	94%	66.1°
2032-01-25 Sun	42	—	unknown	19:05–20:20 (good, 1.25 h)	79.1° 17:40	10.99	98%	77.3°
2032-01-26 Mon	53	—	unknown	19:05–21:20 (good, 2.25 h)	79.1° 17:35	10.96	100%	88.6°
2032-01-27 Tue	64	—	unknown	19:10–22:25 (good, 3.25 h)	79.1° 17:30	10.93	100%	99.8°
2032-01-28 Wed	76	—	unknown	19:10–22:40 (good, 3.5 h)	79.1° 17:25	10.9	98%	111.0°
2032-01-29 Thu	91	—	unknown	19:10–22:45 (good, 3.58 h)	79.1° 17:25	10.87	95%	122.1°
2032-01-30 Fri	92	—	unknown	19:10–22:40 (good, 3.5 h)	79.1° 17:20	10.84	90%	133.1°
2032-01-31 Sat	92	—	unknown	19:15–22:40 (good, 3.42 h)	79.1° 17:15	10.8	83%	143.7°
2032-02-01 Sun	91	—	unknown	19:15–22:45 (good, 3.5 h)	79.1° 17:10	10.77	76%	153.4°
2032-02-02 Mon	90	—	unknown	19:15–22:40 (good, 3.42 h)	79.1° 17:05	10.74	66%	160.3°
2032-02-03 Tue	88	—	unknown	19:15–22:35 (good, 3.33 h)	79.1° 17:05	10.71	57%	160.9°
2032-02-04 Wed	86	—	unknown	19:15–22:30 (good, 3.25 h)	79.1° 17:00	10.67	46%	154.2°
2032-02-05 Thu	82	—	unknown	19:20–22:30 (good, 3.17 h)	79.1° 16:55	10.64	36%	143.6°
2032-02-06 Fri	81	—	unknown	19:20–22:25 (good, 3.08 h)	79.1° 16:50	10.6	25%	131.3°
2032-02-07 Sat	78	—	unknown	19:20–22:20 (good, 3.0 h)	79.1° 16:50	10.57	16%	118.0°
2032-02-08 Sun	76	—	unknown	19:20–22:15 (good, 2.92 h)	79.1° 16:45	10.53	8%	104.1°
2032-02-09 Mon	72	—	unknown	19:25–22:10 (good, 2.75 h)	79.1° 16:40	10.49	3%	89.8°
2032-02-10 Tue	70	—	unknown	19:25–22:10 (good, 2.75 h)	79.1° 16:35	10.46	0%	75.3°
2032-02-11 Wed	68	—	unknown	19:25–22:05 (good, 2.67 h)	79.1° 16:30	10.42	1%	61.0°
2032-02-12 Thu	65	—	unknown	19:25–22:00 (good, 2.58 h)	79.1° 16:30	10.38	4%	47.1°
2032-02-13 Fri	59	—	unknown	19:25–21:55 (good, 2.5 h)	79.1° 16:25	10.34	10%	34.3°
2032-02-14 Sat	49	—	unknown	19:30–21:45 (good, 2.25 h)	79.1° 16:20	10.3	18%	23.7°
2032-02-15 Sun	40	—	unknown	19:30–21:35 (good, 2.08 h)	79.1° 16:15	10.26	28%	18.5°
2032-02-16 Mon	31	—	unknown	19:30–21:20 (good, 1.83 h)	79.1° 16:10	10.22	38%	21.9°
2032-02-17 Tue	24	—	unknown	19:00–22:05 (marginal, 3.08 h)	79.1° 16:10	10.18	48%	30.7°
2032-02-18 Wed	19	—	unknown	19:35–21:55 (marginal, 2.33 h)	79.1° 16:05	10.14	58%	41.2°
2032-02-19 Thu	17	—	unknown	19:35–21:50 (marginal, 2.25 h)	79.1° 16:00	10.1	67%	52.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-01-21&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.